• Title/Summary/Keyword: Telemetry data

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A Study on the Telemetering Results of KSR-III Flight Test (KSR-3 비행시험 원격측정시스템 운용 결과)

  • Lee, Sang-Rae;Lee, Soo-Jin;Kim, Sung-Wan;Lee, Jae-Deuk
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.31 no.6
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    • pp.96-101
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    • 2003
  • Korea Sounding Rocket(KSR)-III onboard telemetry system has acquired various data from subsystems and sensors in the rocket, and radiated PCM/FM data using two S-band antennas during the flight. Simultaneously, it is necessary that the ground receiving systems track the rocket, and receive and decode telemetry data. Also post processed telemetry data are needed to be broadcasted on ethernet network in real time. Range safety display system displays flight trajectory using telemetry data in mission control center, and so flight manager makes a decision for flight termination from the trajectory This paper describes operating technique about telemetry reception, the development for the realtime data processing system, and the results for telemetering reception on fight test. We telemetered, processed, and broadcasted numerous telemetry data during the flight test successfully.

Telemetry Performance Enhancement Using the Time-delayed data (시간지연데이터를 이용한 원격측정 성능향상)

  • Koh, Kwang-Ryul;Lee, Sang-Bum;Kim, Whan-Woo
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.39 no.2
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    • pp.170-177
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    • 2011
  • This paper proposes a telemetering method that transmits the real-time data together with the time-delayed data and that merges both data after flight test. The method can minimize the error data which occur in the communication environment affected by the multipath fading and transmit antenna pattern when telemetry data are received during the flight test. This method was applied to the design of the telemetry unit and the development of data merging program. By merging the resulting data of flight test and analyzing synchronization errors, its efficiency for the telemetry link is verified.

Link Margin Analysis on Telemetry for KSLV-I Launch (KSLV-1 발사를 위한 원격측정신호 Link Margin 분석)

  • Oh, Chang-Yul;Lee, Sung-Hee;Kim, Dong-Hyun;Kwon, Sun-Ho
    • Aerospace Engineering and Technology
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    • v.8 no.2
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    • pp.105-112
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    • 2009
  • Telemetry data is very important for the Launch Mission and Flight Safety Control during the Space Launch. In Naro Space Center, several telemetry stations such as a small station in the NARO space center, two stations in Jeju and a downrange station on a ship are deployed for the stable acquisition/receiving of the telemetry signals. In this paper, the Link Margin and Reliability for the telemetry are analyzed to evaluate the probability of the signal receiving of each station. Even though the proper analysis is to using the on-board EIRP(Effective Isotropic Radiation Power) values in the direction of the ground station considering the predicted flight trajectory and the locations of the stations, the global EIRP of 95% spatial coverage has been used for the analysis, due to the limitation of the available data.

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Analysis on the detection ability of acoustic telemetry receiver for fish detection by installation depth (설치수심에 따른 어류탐지용 음향 텔레메트리 수신기의 탐지성능분석)

  • Hwang, Bo-Kyu;Shin, Hyeon-Ok
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.43 no.1
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    • pp.83-88
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    • 2010
  • Acoustic telemetry is a useful method to investigate fish behavior and is widely used to obtain biological information. In this study, the detection ability of a mooring-type acoustic telemetry system and the seasonal changes were studied for survey design and data analysis. The system detection range was examined with an underwater noise model, and seasonal changes were estimated with a ray-tracing program and underwater temperature profile data. The field experiment was conducted with two sets of pingers and six receivers to estimate the difference in detection rate by installation depth and to compare the model estimate. Results indicated that the long-range detection ability of the acoustic telemetry system was significantly affected by underwater temperature. The detection rate rapidly decreased near the sea surface or bottom despite that the near-range Signal to noise ratio was sufficient.

Implementation of a portable telemetry system based on wavelet transform. (웨이블릿 알고리즘을 적용한 휴대용 텔레미트리 시스템)

  • 박차훈;서희돈
    • Proceedings of the IEEK Conference
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    • 2000.06e
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    • pp.113-116
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    • 2000
  • In this paper presents the portable wireless ECG data detection and diagnosis system based on discreet wavelet transform. An algorithm based on wavelet transform suitable for real time implementation has been developed in order to detect ECG characteristics. In particular, QRS complex, S and T waves may be distinguished form noise, baseline drift or artifacts. Proposed telemetry system that a transmitting media using radio frequency(RF) for the middle range measurement of the physiological signals and receiving media using optical for electromagnetic interference problem. A standard hi-directional serial communication interface between the telemetry system and a personal computer or laptop, allows read-time controlling, diagnosing and monitoring of system. A portable telemetry system within a size. of 65${\times}$125${\times}$45mm consists of three parts: a digital signal processing part for physiological signal detect or diagnose, RF transmitter for data transfer and a optical receiver for command receive. Advantages of proposed telemetry system is wireless middle range(50m) FM transmission, reduce electromagnetic interference to a minimum. which enables a comfortable diagnosis system at home.

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Characteristics of Patients Undergoing Telemetry in the Cardiology Ward (심장내과 병동의 텔레메트리 적용 환자 특성)

  • Kim, Yoon-Seon;Choi, Hye Ran
    • Journal of Korean Critical Care Nursing
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    • v.7 no.2
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    • pp.14-23
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    • 2014
  • Purpose: The purpose of this study was to provide basic information to develop appropriate nursing guidelines for cardiac telemetry. Methods: This retrospective research was conducted to identify the current usage of cardiac telemetry and considered 1,000 patients hospitalized for telemetry. The collected data were analyzed using IBM (SPSS Statistics for Windows 21.0). Results: Four-hundred and ninety-two patients (49.2%) were diagnosed with arrhythmia and 209 (20.9%) with heart failure. Electrocardiogram (ECG) rhythm changes were detected via telemetry in 464 cases. Major arrhythmias were ventricular tachycardia (183, 39.4%) and bradycardia (99, 21.3%). Interventions after detecting arrhythmia were cardioversion (16, 3.4%), defibrillation (1, 0.2%), and cardiopulmonary cerebral resuscitation (5, 1.1%); other patients were treated conservatively with close observation (381, 82.1%). Conclusion: There was appropriate intervention in 46.4% of the considered cases with the detection of ECG changes before patient notification, which implied that cardiac telemetry could be considered for application to patients with hemodynamic instability. Clear standards and guidelines are required to determine who requires telemetry and when to end the telemetry monitoring.

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Link anlaysis of TTC system for LEO satellite (저궤도 위성 관제 시스템의 링크 특성 분석)

  • 장대익;이점훈;김영완;최재익
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.34S no.7
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    • pp.39-47
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    • 1997
  • The mission of the TTC system is to acquire and process the telemetry data from the satellite and to provide mission planning and satellite control for the target stellite system. In this paper, the transmission scheme for the Tracking, Telemetry and Command(TTC) system of satelliteis described and determined according to the recommendation of CCSDS, and the channel characteristics are analyzed according to modulation method. Expecially, we introduced the concepts of carrier vs. telemetry data power ratio which causes the channel performance to degrade, and analyzed the effects of transmission performance according to the power ratio of carrier vs. telemetry data and the modulation index. The channel of the LEO TTC sytem is different with usual satellite communication system. So, we have generalized the link budget of TTC sytem for using the link budget of ground station well-known and proposed the determination method of modultion indices for improveing channel performance.

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Analysis for the Bit Error Probability in the PCM-NRZ/FM Telemetry System (PCM-NRZ/FM Telemetry 시스템에서 Bit 오차확률에 관한 분석)

  • 강정수
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.8 no.2
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    • pp.76-81
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    • 1983
  • PCM-NRZ/FM Telemetry system is constructed on the basis of RF link with FM modulatedand NRZ-L binary coded PCM data are assumed to transmit through 5th-order Bessel filter. Upon demodulated by the limiter-discriminator at the receiver, the probability of bit error, which is important for performance estimation of digital system, is analyzed against SNR. The analysis based on the following parameters, that is bit rate 140kHz, frequency of pre-modulation filter f-100kHz, maximum frequency deviation of transmitter 2f=300kHz, was performed. As a result, when the telemetry system with the parameters above is designed, the probability of bit error is obtained as 10 along with fT=0.7 and h=2, T=2.

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Communication Data Format Design for LEO Satellite with Packet Utilization Standard (Packet Utilization 개념을 이용한 저궤도 위성의 데이터 통신 포맷 설계)

  • Lee, Na-Young;Lee, Jin-Ho;Suk, Byong-Suk
    • Journal of Satellite, Information and Communications
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    • v.3 no.2
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    • pp.13-17
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    • 2008
  • The conventional telemetry system of Korean low-earth orbiting satellites has certain limitations in accommodating various missions. As the payload becomes complex, it requires very complicated operational concepts in terms of telemetry. With the current design, the telemetry formats have to be rebuilt whenever new payloads or operation concepts are involved, and many constraints in operation shall be produced due to the lacks of its flexibility. As the capability and performance of a satellite have been improved, the communication structure of the satellite should be improved to gather more telemetry data. For the efficiency of data handling, it is necessary to change the grid based telemetry system in which the downlink interval and types for telemetry was limited. Comparing the fixed data map such as grid type, the packet based telemetry system can be operated as flexible and various types of packet can be designed such as the dump packet and the event packet. The sequence of the packets can be modified or newly defined to manage the massive satellite state of health data. In this paper, a new strategy for the telemetry development partially derived from PUS (Packet Utilization Standard) of European Space Agency, which provides enhanced features for the accommodation of payloads & operational requirements, is presented.

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Trends of High Speed Satellite Offline Telemetry Processing (위성 상태 데이터의 고속 후처리 기술 동향)

  • Kang, Ji-Hoon;Koo, In-Hoi;Ahn, Sang-Il
    • Current Industrial and Technological Trends in Aerospace
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    • v.8 no.2
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    • pp.15-23
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    • 2010
  • In this paper, the trends of a satellite offline telemetry processing system had been discussed. The satellite offline telemetry processing system is used to analyze an offline telemetry and to check health status of the satellite. Common requirements for the system are high speed processing, processed data visualization, easiness of use, and generality. Regarding to these requirements, how the recent telemetry processing system had been designed and implemented is discussed in detail.

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